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Googled "Boatowners Mechanical and Electrical Manual" PDF and found a free download. Large file but well worth downloading. Excellent information. https://www.engineerrefe.com/boatowners-mechanical-and-electrical/

Thank you for reply. Think I got it, finally.:blush:

I will be back on boat next month and will check out what I have. I think that the two bus bars that I had installed must be all DC grounds but I want to be sure. Thanks for your explanation

Thank you for such a clear and concise explanation. If I understand correctly all AC ground and neutral wires should be on a separate bus that is grounded back to to the dock pedestal. All DC grounds should be on a bus that is grounded to only to the engine, etc. That makes good sense but it...

Sorry about color, it is yellow. I am not an electrician and had the busses professionally installed. I am a little confused by all this. If the AC neutral and ground are connected to the engine and the DC neutral is connected to the engine via a combined wire or separately, what is the...

Tried to edit my post but it failed to update. To be clear, the first picture is the "before" picture. There were way too many wires, poor terminal connectors, loose screws, etc. So remove the old bus and installed two new ones, the one on the left for the large wires and the one on the left for...

No, both bars have a common ground. If you look closely at the second picture you can see the red jumper connecting the two bus bars. I chose two bars to accommodate the various size wires. I also have a galvanic isolator to isolate the boat from the dock pedestal.

1976 42' GBCL old ground and new ground. New ground bars solved my problems.